Biology is too "complicated" for our intelligence at least.

His point was more along the lines of it being poorly designed.

Evolution isn't going to nicely separate functionality into clean, single-purpose biochemical pathways.

It's going to overload something that it already has to support a new feature, leading to a rat's nest of intertwined effects.

The hard part in drug development isn't affecting your target: that's pretty easy to guarantee with modern tools. It's finding out that that target also governs 10 other, completely unrelated bodily functions.

> It's going to overload something that it already has to support a new feature,

Some companies in the valley just call that Wednesday.=)

Absolutely, which gives me a chuckle when people trivialize biology, but run screaming from a (gasp!) 20 year old legacy codebase.